Channel 4 has appointed Alex Mahon, the former boss of the maker of MasterChef and Broadchurch, who now runs the special effects firm behind Hollywood blockbusters including Gravity and Guardians of the Galaxy, as its new chief executive.

Mahon becomes the first woman to run a UK broadcaster larger than Channel 5. She is the first female Channel 4 chief executive in the broadcaster’s 35-year history.

“Alex is an outstanding leader and a highly experienced chief executive who has developed and grown major international businesses in both the creative and technology sectors,” said the Channel 4 chairman, Charles Gurassa.

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“She brings an impressive combination of relevant experience and is brilliantly placed to help steer Channel 4 through the competitive challenges and opportunities ahead.”

Mahon will take over from David Abraham, who leaves later this year, and will immediately face the prospect of negotiations with the government over the relocation of Channel 4 out of London.

Scottish-born Mahon has previously worked closely with the Department for Culture, Media and Sport, having served as a member of the advisory panel put together to help map out the future scope and remit of the BBC ahead of the renewal of its royal charter last year.

“She is a great enthusiast for Channel 4 and its unique public service remit and her recent work with government will be valuable in facilitating constructive dialogue with the new administration,” said Gurassa.

Mahon is expected to start the £900,000 a year job in October or November and will be involved with the appointment of Hunt’s successor.

Hunt is due to leave at the end of September, after handling the launch of Great British Bake Off which the broadcaster poached from the BBC last year.

“Channel 4’s unique remit to innovate and to appeal to young and diverse audiences make it an essential part of British culture,” said Mahon. “There is nowhere in the world like Channel 4 and, in these changing times, its mission is more important than ever. I’m incredibly proud to be joining Channel 4 and bring to it experience both of leading creative organisations at scale and dealing with an environment of constant technological change.”

Mahon joins from Foundry, a design and visual effects software firm with film credits including Guardians of the Galaxy and technology licensing deals with Hollywood heavyweights such as Disney, Weta Digital and Sony Pictures Imageworks, which she has run since 2015.